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US 5,396,553 AGranted
Automatic loss control circuit
AssigneeAT&T Corp.
InventorsLance J. Haughton, David R. Rice
Life of this patent
Estimating the term…
Abstract
Disclosed is a circuit for providing an appropriate amount of on-hook loss in a digital loop carder transmission system serving telephone customers. The resistance of the customer loop is measured while the customer is off-hook and an amount of loss is added based on that resistance during the off-hook interval. A predetermined constant loss is then added to the appropriate off-hook loss when the equipment returns to on-hook status.
Claims8
A circuit for automatic adjustment of signal loss in loops of a digital loop transmission system comprising:
- means for detecting a resistance of a loop when customer equipment in that loop is off-hook;
- and
- a microprocessor coupled to the detection means and including means for determining an amount of loss to be applied to the loop as a function of the detected resistance while the equipment is off-hook, the microprocessor also including means for adding a constant amount of loss to said determined amount of loss while the equipment is on-hook such that the total loss applied to the loop while the equipment is on-hook is a function of the detected resistance of the loop.
Dependencies are inferred from the claim text.